Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e4aeb58195cae6…

MALICIOUS

PDF

68.1 KB Created: 2020-11-20 03:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d9e88d5178e68ca89fc471d6263bcd5 SHA-1: 2195218c6a3f066a95a72ea6b6524f18d61e4cca SHA-256: 26e4aeb58195cae6533db76b13cad4c11ccab540a41a67012656fb491a80d397
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm, and a 'download button' lure suggests a social engineering tactic to trick users into downloading further malware. The SE_CLICKFIX heuristic indicates the document may also attempt to trick users into executing commands directly, further supporting a malicious social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/aws?utm_term=championship+manager+03+04+data+editor PDF link annotation
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/1809168.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/e6175a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_5fb00e0b29789.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/3070378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f8c8a4bc1d74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_5fabeb9fb387f.pdfIn PDF document text
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/9735ee27477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe91afa-0d5a-4a2a-8f37-5b46889f1b2d/20173988415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ac81c8-0916-4d86-a307-8fe46c3f3d2f/zagif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8bb7bba-9caf-461a-a8a1-b909005ba823/san_ramon_unified_school_district_special_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4bcb4b-4e7b-4ebd-aac0-2411db44f5f8/84774869813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52efce4-c493-4ec4-a092-9792bd80593f/conjugate_the_spanish_verb_to_be.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 5640 bytes
SHA-256: 5bf99f972cc49401ae189c5c142bf5781885a39432913180f86e685a35c57a82
font_01_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 10440 bytes
SHA-256: 722f08f4ba325adba949989b8430062d90f19d2b166def66955257381c5379fe

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